Not a good look for the founder of interviewing.io: "I’ve been coding for a pretty long time. Since 1982, actually. There’s no data structure called 'a grouping

Not a good look for the founder of interviewing.io: "I’ve been coding for a pretty long time. Since 1982, actually. There’s no data structure called 'a grouping' in any language I’ve ever used. So what assumptions are you going to make about the problem?" But--there's absolutely a data interface in C#/.Net called "a grouping". It's fundamental to LINQ: https://docs.microsoft.com/en-us/dotnet/api/system.linq.igrouping-2 https://docs.microsoft.com/en-us/dotnet/api/system.linq.igro... Shameful to spread the idea that software developers haven't created an industry-standard interface for groupings of enumerable data in 2020.